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choicefield.go
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choicefield.go
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package aform
// ChoiceField is a field type that validates that the given value is one of
// the options listed with WithChoiceOptions or WithGroupedChoiceOptions.
type ChoiceField struct {
initialValue string
*Field
}
// verify interface compliance
var _ fieldInterface = (*ChoiceField)(nil)
// NewChoiceField creates a choice field named name. The parameter initial is
// the initial value before data bounding. To add options use WithChoiceOptions
// or WithGroupedChoiceOptions. The default Widget is Select. To change it, use
// WithWidget or Field.SetWidget.
func NewChoiceField(name, initial string, opts ...FieldOption) (*ChoiceField, error) {
cf := &ChoiceField{
initial,
&Field{
name: name,
boundValues: []string{initial},
errors: []Error{},
optionGroups: []choiceFieldOptionGroup{},
fieldType: ChoiceFieldType,
widget: Select,
autoID: defaultAutoID,
label: name,
labelSuffix: defaultLabelSuffix,
locale: defaultLanguage,
},
}
cf.Field.validateFunc = choiceFieldValidationFunc(cf)
for _, opt := range opts {
if err := opt(cf.Field); err != nil {
return nil, err
}
}
return cf, nil
}
// DefaultChoiceField creates a choice field with reasonable default values.
// initial parameter is the empty string. To add options use WithChoiceOptions
// or WithGroupedChoiceOptions.
func DefaultChoiceField(name string, opts ...FieldOption) (*ChoiceField, error) {
return NewChoiceField(name, "", opts...)
}
func (fld *ChoiceField) field() *Field {
return fld.Field
}
// Clean returns the cleaned value. value is first sanitized and
// finally validated. Sanitization can be customized with
// Field.SetSanitizeFunc. Validation can be customized with
// Field.SetValidateFunc.
func (fld *ChoiceField) Clean(value string) (string, []Error) {
fld.boundValues = []string{value}
sanitizedValue := fld.sanitize(value)
if fld.notRequired && len(sanitizedValue) == 0 {
return fld.EmptyValue(), nil
}
fld.errors = customizeErrors(fld.validateFunc(sanitizedValue, !fld.notRequired), fld.customErrors)
return sanitizedValue, fld.errors
}
// EmptyValue returns the ChoiceField empty value. The empty value is the
// cleaned value returned by Clean when there is no data bound to the field.
// A ChoiceField empty value is always the empty string "".
func (fld *ChoiceField) EmptyValue() string {
return ""
}
func choiceFieldValidationFunc(fld *ChoiceField) func(string, bool) []Error {
return func(value string, required bool) []Error {
notRequiredAndEmpty := !required && len(value) == 0
if notRequiredAndEmpty {
return []Error{}
}
var choices []string
for _, group := range fld.optionGroups {
choices = append(choices, group.values()...)
}
return validateValue(value, buildValidationRules(required, buildValidationChoicesRule(choices...)))
}
}